Nemzetbiztonsági Hivatal (NBH) is the name of the Hungarian secret service.
It was reorganised after the fall of the socialist era 1989, and it should now follow the modern law-based kind of information gathering and government support.
... of characteristic 2, the element 2a is zero and it is impossible to divide by it.)
The symbol
<math>\pm \sqrt {b^2-4ac}</math>
in the formula should be ...